Combination grinder and tool dresser



Nov. 27, 1945. 3. s. ROSE 2,389,871

COMBINATION GRINDER AND TOOL DRESSER Filed June 12, 1944 4 Sheets-Sheet 1 Inventor My 3 I ttoreys Nov. 27, 1945. c s, O 2,389,871

COMBINATION GRINDER AND TOOL DRESSER Filed June 12, 1944 4 Sheets-Sheet 2 Inventor NOV. 27, 1945. 3 ROSE COMBINATION GRINDER AND TOOL DRESSER 4 Sheets-Sheet 3 Filed June 12, 1944 Inventor Nov. 27, 1.945. c, s, ROSE 2,389,871

COMBINATION GRINDER AND TOOL DRESSER Filed June 12, 1944 4 Sheets-Sheet 4 3 Inventor By 2mm I 1 v WWW 8,5

Patented Nov. 27, 1945 QOMBsINA-IIQN GRINDERAND TOOL DRES SEE Charles S. Rose, Agency, Iowa Application .Iunelfl, 1944*,1S1eriakNo: 539,837

12 Claims.

This; invention relates to a, multiple purpose machine-of: a combination typecharacterized by a: single electric motor-onequivalent prime mover and a, plurality of shafts, driven therefrom, said shafts being. provided with selectively-usable devices for grinding; sharpening and dressingvarious cutting tools and instruments.

More specifically, I have evolved and produced a comparatively simple, reliable and: com-pact structural assemblage which lends itself admirably well to various requirements of widespread tool grinding; sharpening and "finishing-results.

In carrying out the preferredprinciples of the invention I have adopted-a simpleelectric motor driving two. axiallylaligned'shafts carrying appropriate grindstones; one shaft; being: expressly elongatedxand provided; with a. worm, the latter to operate a novel Whetstone: unit.

Novelty is predicated upon the aforementioned Whetstone unit, this characterizediby a feasible and practicable-oil pump-and circulating system in whichsoil is pumped through. the hollow turning shaft for: thegwhetstone. and is {spilled over the surfaces thereof toe-provider the desired film and is thentrapped and returned, to. thecirculating pump.

Other features and advantages will become more readily apparent fromthe. following description and the accompanying, illustrativedrawings.

In the drawings; whereinlikenumerals are. em-

ployred to, designate; like-.- parts: throughout: the same V Figure lis av side e1evational:. view. oflthe single motor triple-grimier assemblage as constructed inv accordance with the: principles-of? this invention. 7

Figure 2 is a top plan view-ofithe'structura seen in Figure:1.

Figure 3- is. an end elevation ofithe, same Figure 41s. a centralvertical section through the Whetstone unit disclosing; the internal construction thereof.

Figure 5 is a horizontal section-on the plane of the-line; 5,-5. of Figure 41,. lookingsdownwardly in the:dircctiomofithearrows.

Figures Gandfl are-horizontal sections onthe lines" 6-45; and l -l ofrFigure 4-.:

Figure 8 1518. view similarto Figure-5, that is, a horizontal section, this'showing' agslight modification in, thearrangement and adjoining of parts.

Figure- 9; is a central vertical section similar to Figure 4, showing; a modified form ofwhetstone tool dresser unit.

Attention is directed firstto the form of the involition-depicted in Figures; 1 ate: 1,. inclusive.

Referenee-beinghad first to Figure 1, it will be seen that: the overall assemblage is characterizedbya-motor, a pair of longitudinally spaced grindstonesson opposite sides thereof and an intervening whetstone too-l dresser unit.

The motor is denoted by the numeral lll'and oflany appropriateconstruction, the same being: supported on a suitable base I I. At the left is an appropriate bearing l2 or short shaft, said shaft: having ansuitable grindstonel3 clamped thereon-andsaid grindstoneope'rating in a guard ortshield'lfi; As shown in Figure 5, the elongated bearingtfi' onthe opposite side. of the motor is provided .Withan extendedshaft it which is provided with clamping means for grindstone l3a and an opensguard or shield Map I next direct attention tov the Whetstone unit which is an integral part of the casing structure and. is'denoted, generally speaking, by the numerall IT: This is' driven by a power take-oifworm lhzformed on the motor shaft (see. Figure 5) The: construction of the unit ll can best be seen: in..Figure 4 wherein [9 denotes a perpendicular cylindrical. housing or casing having an elevatedibottom 2'03. and a central frusto-conical mound 2i which .:serves as a bearing or mount fonspeed-reduoing motion-transmitting gear 22.

The. gear corresponds in shape to the mount 21 and is keyedon a tubular central perpendicular shaft 23:, this-shaft extending through a bushing and being provided'at its lower end with a ballscheck valve 25 coasting with an appropriatexinsertorseat. The upper end oi'the shaft is;screwthreaded and serves to accommodate the whetstoneoZfi. The Whetstone. is provided with a hub 01:- collarfi'which is threaded on said shaft 23. Also the Whetstonev fits on a table 28 keyed orr-the shaft, this table resting on an end-thrust bearing Zi and having a marginal downturned flange. The bearing 29 is formedintegral with the: partition 30 above which is an upstanding annular'rshell 3! with an inturned anti-splash lip orflange 32; theseparts defining an oil receiving andreturntran, A cup 33 at the bottom is suitablysfastened'in place and constitutes an oil reservoir orsump 3'4. Incidentally, oil is returned from-the. trap to the sump by Way of a gravity return duct 35; An end-thrust plate 36 in the oil sump coaots with the partition or false bottomlildefining a simple pump chamber 31 (see Figure. 6):. The pump comprises a cam 38 keyed on the-gear driven tubular shaft 23, the cam coacting with a valving element; 39 suitably arranged-1and'pressedagainst the cam by a coiled spring. The elements 38- and 39 serve to force stone and runs the oil slowly through the force-fed duct 4|. Oil is delivered from the sump into the oil pump chamber by way of the inlet port 42.

There may be a tendency for oil to seep into the hollow space which surrounds the bearings in the walls 20 and 2| (see Figure 4) and, if so, a return drain 43 serves to deliver the oil back to the sump.

Assuming that the sump ischarged with oil it is evident that as the worm gear I 8 rotates the power take-off speed reducing gear 22 the latter rotates the hollow valved shaft 23. The shaft rotates the platform or table 28 and the Whetstone 26. In addition, it drives the oil circulating pump. The oil is taken into the pump chamber 31 by way of the intake port 42 and is slowly fed under slight pressure through the duct 4| and into the bore of the shaft by way of the check-valve 25. As the oil rises in a column it spills and spreads over the surface of the whetdown over the marginal perimeter where it is retrieved in the trap 3|. From the trap it is fed back into the sump as before indicated, by way of the return duct 35. Thus, a simple pump and sump arrangement serves to provide for circulation of oil to keep the stone sufficiently moist for tool dressing and finishing.

As before indicated, novelty is predicated on the triple-acting assemblage characterized by the centralized prime mover or motor ID, the simultaneously driven shafts and grind wheels l3 and Kid; these parts in conjunction with the whetstone unit, also receiving its power from the same motor. The numeral 44 in Figure'3 represents a clean-out plate for draining the oil. The cup can be filled either by removing it, or can be filled by way of the return duct 35.

In the figures so far described (see Figure again) the Whetstone unit is formed integral with the motor casing and bearing housing members. If desired, the unit can be made for detachable assemblage as brought out in Figure 8. Here, the shaft housin 45 is suitably pocketed to accommodate the worm gear and is left open on one side and provided with an adapter flange 46 to which the casing I9 is bolted as at 47.

A modified unit is indicated at |1a in Figure 9. Here, the cylindrical casing 48 has its lower end portion 49 fashioned into an oil reservoir or sump and is provided with a partition 50, this having bearings to accommodate the tubular oil delivery Whetstone flushing shaft 5|. The upper partitioned end 52 defines a trapping receptacle 53 in which the flanged table 54 rotates, said table carrying the Whetstone 55 attached to the threaded shaft by a hub-collar ornut 56. The partition 52 is provided with a bearing 51 to accommodate the shaft and the shaft is provided with a speed-reducing gear 58 having marginal teeth 59 to coact with the worm (not shown). The gear 58 is of inverted cup-like form and houses a smaller gear 60 also keyed on said shaft 5| and driving a power-take-olf pinion 6| which, in turn, drives a suitably supported shaft 62. This shaft 62 servesto drive one of theelements 63 of a simple gear pump mounted in the gear pump housing 64. The other gear pump element 65 is on the shaft 5| and the U-shaped duct, which feeds the oil to the bore in the shaft 5| is indicated at 66. The numeral 67 designates an oil return or drain from the base 68 to the sump 49. The numeral 69 is the oil duct, that is, the return duct from the trap'to the sump. Suitable means is provided to deliver the oil from the sump into the pump chamber.

v.ing, sharpeningcand dressing tools and instruments of manydifferent types and varieties. It is characterized by a carefully chosen arrangement and coordination of parts, the parts being ingeniously arranged to make for compactness and convenience from the standpoint of manufacture on the upper end of and use. Experience will be the best teacher as to the best modes and methods of using the selectively employable grinding and finishing elements. Therefore, I shall not dwell upon the commercial aspects of the invention.

It is thought that persons skilled in the art to'which the invention relates will be able to obtain a clear understanding of the invention after considering the description in connection with the drawings. Therefore, a more lengthy de scription is regarded as unnecessary.

Minor changes in the shape, size and arrangement of details coming within the field of invention claimed may be resorted to in actual practice, if desired.

Having described the invention, what is claimed as new is:

1. In a structure of the class'described, an oil bathed Whetstone unit comprising a casing having vertical'vertically spaced bearings, a tubular shaft mounted for horizontal rotation in said bearings, a check valve on the lower end of said tubular shaft, a gear on said shaft for rotating the same, a motor'including a shaft, an opera ing connection between the motor shaft and gear, a pump structure in the lower portion of said casing for feeding oil to the interior of the shaft through the check valve, an oil reservoir for feeding oil to the pump structure, an operating connection between said shaft and pump structure,

anda Whetstone on the upper end of said shaft.

2. In a structure of the class described, an oil bathed Whetstone unit comprising a casing having vertical vertically spaced bearings, a tubular shaft'mounted for horizontal rotation in said bearings, a check valve at the lower end of said tubular shaft operative to prevent the discharge of fluid from the lower end thereof, a gear on said shaft for rotating the same, a motor including a shaft, an operating connection between the motor shaft'andv gear, a pump structure in the lower portion of said casing, an oil reservoir for feeding oil to the pump structure, an operating connection between said pump structure and the check valve, and a Whetstone on the upper end of said shaft, that portion of the casing surrounding the Whetstone being fashioncd'into a trap and being provided with an oil return duct leading back to the reservoir.

I 3. In a Whetstone unit of the class described, a

casin provided at its top with a partition having a central bearing, and a portion projecting above said bearing and defining anoil trap, a tubular vertical shaft journaledfor horizontal rotation in said bearing, a Whetstone mounted the tubular shaft, a table on said shaft resting on said bearing and confined in said trap, a check valve at the lower end of the shaft, oil pump means in thelower portion of said casing for delivering oil to the interior of the .shaft' through'the check valve whereby a constantly upwardly flowing column of oil is maintained within the hollow shaft, means for rotating the shaft, means for driving the oil pump means from said shaft, an oil reservoir in the lower portion of the casing, and a return duct leading from said trap to said reservoir.

4. In a Whetstone unit of the class described, a casing, bearing means in the lower portion of the casing, a tubular vertical shaft journaled for horizontal rotation in said bearing means, a speed-reducing gear keyed on said shaft, a motor driven shaft extending into said casing and having a worm in mesh with said speed-reducing gear, pump means built into the lower portion of the casing, an operating connection between the shaft and pump means, an oil reservoir associated with the pump means and embodied in the lower portion of said casing, the upper portion of the casing being provided with an end-thrust bearing, the adjacent portion of the shaft being mounted for rotation in said bearing, a plate on said shaft resting on said bearing, that portion of the casing surrounding said plate defining an oil trap, a return duct from said trap to the reservoir, a Whetstone on the shaft, a valve in the lower portion of the tubular shaft, and a duct from the pump means to the valve.

5. In a Whetstone unit of the class described, a casing provided at its bottom with an oil sump, a gear pump mounted in said sump and in communication with the sump, bearings mounted in said casing, a, tubular shaft mounted in said bearings, a Whetstone carried by the upper end of said shaft, oil trapping and return means surrounding the whetstone and formed in the upper portion of said casing, a power receptive gear keyed on said shaft, a smaller gear also keyed on said shaft, a pinion shaft, a pinion on said shaft in mesh with said gear, said pinion shaft serving to rotate one of the gear pump elements, the remaining gear pump element being carried by the lower end of said shaft.

6. A grinding device consisting of a vertical tubular shaft, bearings for supporting the same for rotation, a motor having driving engagement with the vertical tubular shaft, a pump housing enclosing the lower end of the vertical tubular shaft and provided with a pump rotor mounted to turn with the shaft, a grinding wheel mounted on the upper end of the shaft to turn in a horizontal plane, a receptacle enclosing said grinding wheel and provided with a drain communicating with the pump chamber at its lower end, said pump chamber having an inlet and an outlet, the outlet communicating with the lower end of the vertical tubular shaft, a check valve in said shaft, and a valve in said pump chamber automatically opened by said pump rotor to control the flow through said inlet.

7. A grinding device consisting of a housing having vertical bearings, a tubular shaft mounted to turn in said bearings, a grinding wheel mounted on the upper end of the tubular shaft, a pump chamber enclosing the lower end of the tubular shaft, a pump rotor mounted on said shaft and having a cam projection, said pump chamber having an outlet communicating with the tubular shaft and an inlet, and a spring closed valve controlling said inlet and arranged to be engaged by the cam projection of said pump rotor, whereby said valve will be automatically opened and closed as the rotor is turned.

8. A grinding device comprising a hollow tubular shaft mounted to rotate about a vertical axis, a Whetstone mounted at the upper end of the shaft, means constantly to maintain a column of oil throughout the entire length of the tubular shaft and means upon rotation of the shaft to cause the oil column to flow upwardly and over the top surface of the Whetstone.

9. A grinding device comprising a hollow tubu lar shaft mounted to rotate about a vertical axis, a Whetstone mounted at the upper end of the shaft, a check valve at the lower end of the tubular shaft constantly to maintain a column of oil throughout the entire length of the interior thereof, and means upon rotation of the shaft to cause the oil column to flow upwardly and over the top surface of the Whetstone.

10. A grinding device comprising a hollow tubular shaft mounted to rotate about a vertical axis, a Whetstone mounted at the upper end of the shaft, means constantly to maintain a column of oil throughout the entire length of the tubular shaft, and a pump operable upon rotation of the tubular shaft to feed oil into the bottom of the tubular shaft and cause the oil column to flow upwardly and spread over the top surface of the Whetstone.

11. In a combination grinder, a drive shaft rotatable on a horizontal axis, a hollow tubular shaft mounted to rotate about a vertical axis, grinding wheels carried by opposite ends of the drive shaft, a power takeoff intermediate the ends of the drive shaft, a tubular shaft rotatable on a vertical axis and driven by the power takeoff, a grinding wheel at the upper end of the vertical shaft, a pump at the lower end of the vertical shaft for feeding oil into the interior thereof,

and means to retain a column of oil constantly within the vertical shaft.

12. In a combination grinder, a grinding device comprisin a drive shaft mounted to rotate about a horizontal axis, grinding wheels carried by opposite ends of the drive shaft, a power takeoff intermediate the ends of the drive shaft, 9, tubular shaft rotatable on a vertical axis and driven by the power takeoff, a, grinding wheel at the upper end of the vertical shaft, a pump at the lower end of the tubular shaft for feeding oil into the interior thereof, and a valve at the lower end of the vertical shaft to retain a column of oil constantly within the interior thereof.

CHARLES S. ROSE. 

